how to fi andnd the surface area of pacman with a 3/4 left with 8cm width and 6cm length

Nice pic!!

The top surface area is given by (3/4)pi(8cm)²

The bottom is the same...so we have 2(3/4)pi(8cm)²  = (3/2)pi(8cm)²  = 96pi cm²

The curved surface area is given by (3/4)(2)(pi)(8cm)(6cm) = (3/2)pi(48)cm² = 72pi cm²

Then, we have two rectangles "inside" whose total area is 2(8cm)(6cm) = 96 cm²

So the total surface area = [96pi cm² + 72pi cm² + 96 cm² ] = [168pi + 96] cm²

And if we use 3.14 for pi, we have [168(3.14) + 96'] cm²  ≈ 623.52 cm²

The picture wasn't there and now it is! Spooky!